Type 3277 Actuator - Samson 3731-5 Mounting And Operating Instructions

Mounting and start-up
fastening screws. Check whether the fol-
lower pin (2) rests on top of the follower
clamp (3). The lever (1) must rest on the
follower clamp with spring force.
During mounting, make sure that the seal
(10.1) is inserted in the borehole of the
cover plate.
10. Mount cover (11) on the other side.
Make sure that the vent plug (11.1) is lo-
cated at the bottom when the control
valve is installed to allow any condensed
water that collects to drain off.

5.4 Type 3277 Actuator

Î Required mounting parts and accesso-
ries: Table 2 on page 17.
Actuators with 175 to 750 cm² areas
Mount the positioner on the yoke as shown
in Fig. 6. The signal pressure is routed to the
actuator over the connection block (12), for
actuators with fail-safe action "actuator stem
extends" internally through a hole in the
valve yoke and for "actuator stem retracts"
through an external pipe.
1. Place follower clamp (3) on the actuator
stem, align it and screw tight so that the
mounting screw is located in the groove
of the actuator stem.
2. Mount cover plate (10) with narrow side
of the cut-out (Fig. 6, on the left) pointing
towards the signal pressure connection.
Make sure that the gasket (14) points to-
wards the actuator yoke.
3. Actuators (355, 700 and 750 cm²):
Remove the follower pin (2) from the pin
position 35 on M lever (1), reposition it
32
in the hole for pin position 50 and screw
tight.
Actuators (175 to 350 cm²) with 15 mm
travel: the follower pin (2) remains in pin
position 35 (delivered state).
4. Insert the formed seal (15) into the
groove of the positioner enclosure, press-
ing the four retaining rings over the en-
closure screws and both fittings into the
enclosure recesses.
5. Thread the bias spring (17) through the
crosspiece underneath the lever (1) and
push it into the hole in the enclosure.
Push the lever (1) until it engages into
place. Place the positioner on the cover
plate (10) and fasten it using the three
fastening screws. Check whether the fol-
lower pin (2) rests on top of the follower
clamp (3). The lever (1) must rest on the
follower clamp with spring force.
6. Make sure that the tip of the gasket (16)
projecting from the side of the connec-
tion block is positioned to match the ac-
tuator symbol for the actuator's fail-safe
action "actuator stem extends" or "actua-
tor stem retracts". If this is not the case,
unscrew the three fastening screws and
lift off the cover. Turn the gasket (16) by
180° and re-insert it. The old connection
block version (Fig. 6, bottom) requires
the switch plate (13) to be turned to align
the actuator symbol with the arrow mark-
ing.
7. Actuators (175 cm²): unscrew the filter
from the signal pressure input and first
screw the screw restriction (accessories
order no. 1400-6964/item no. 0390-
EB 8387-5 EN